Lubricating system for punch presses



April 4, 1939. WALTER 2,153,219

LUBRICATING SYSTEM FOR PUNCH PRESSES Filed April 24, 1936 Fig. 1.

W III! Patented Apr. 4, 1939 UNITED STATES PATENT OFFICE LUBRICATING SYSTEM FOR PUNCH -PRESSES Jersey Application April 24, 1936, Serial No. 76,249 In Germany May 25, 1935 10 Claims.

This invention relates to a lubricating system for punch presses and includes means, controlled by operation of the press itself, for spraying oil on to the work upon which the press operates,

* the invention having for its object to provide improved apparatus wherein the necessity for incorporating in the press means for generating pressure for the oil will be obviated.

The invention is particularly directed to a lubrieating system for punch presses, which system comprises apparatus for spraying oil on to the work upon which the press operates, an oil supply chamber or reservoir from which oil is supp-lied to the spraying apparatus, means whereby air is 5 suppliedunder pressure generated independently of the press itself, to the supply chamber and to the oil spraying apparatus, and a control device actuated by operation of the press so as to control the delivery of the air under pressure to the chamber and to the oil spraying apparatus.

Thus, in a press embodying the invention the pressure necessary to maintain the oil supply is not derived from the press itself as in some known arrangements wherein the reciprocating ram or punch operates a pumping device for supplying the oil. The oil supply pressure is therefore, with the present invention, not only variable at will irrespective of the conditions of operation of the press, but the maximum available pressure is not limited by reason of such conditions. Alternatively, with varying speeds of operation of the press the oil pressure may be maintained constant.

Although the punch press disclosed herein is specifically of the perforating type, it is obvious that the lubricating system of the invention is equally applicable also to cutting or drawing presses which may also require lubrication of the stock prior to the press operation.

The press conveniently comprises a ram reciprocated by an eccentric mounted on a driving shaft, and a valve controlling the delivery of the air under pressure to the chamber and spraying 45 apparatus, the valve being operated by a cam driven by the said driving shaft.

The oil spraying apparatus may comprise a single member 01' two members each having therein two longitudinal bores extending from no the opposite ends of the member and to which the air under pressure and the oil are supplied respectively and at least one nozzle communicating with both the said bores and directed towards a face of the work upon which the press operates.

Inthe accompanying drawing,

Figure 1 illustrates, in side elevation, a punch press embodying one form of the invention,

Figure 2 is a vertical section through the oil spraying devices included in Figure 1 but on a larger scale,

Figure 3 is a vertical section transverse to that of Figure 2, and

Figure 4 shows a modified arrangement of the air supply conduits.

In the construction illustrated the press comprises a main shaft A to which the drive is transmitted from a belt (not shown) through a pulley A the shaft A being journalled in bearings at the upper end of a frame B which is supported on a base B. An eccentric C carried by the main shaft A transmits reciprocating movement through a connecting rod C and crosshead C to a perforating punch which is not shown but cooperates with a perforating die upon an anvil D carried by the frame. Secured to the main shaft A is a cam E which acts on the stem E of a valve arranged in a cylinder E and loaded by a spring (not shown) which urges the valve towards the closed position, that is to say towards the cam E.

Air is supplied under pressure, generated independently of the press itself, through a main air supply pipe F to the valve cylinder E A pipe G leads from the valve cylinder E to the upper end of an oil reservoir G, a pressure reducing valve G being arranged inthe pipe G A second pipe G leads from the valve cylinder E through two branch pipes H and J to two oil spraying members H and J arranged respectively above and below the work K, such for example as steel strip to be punched. The lower end of the oil reservoir G communicates through branch pipes H and J with the adjacent ends of the oil spraying members H and J which thus extend transversely to thedirection in which the work K is fed to the press. The Valve E is operated by the cam E so as to control the supply of air from the main air supply pipe F through the pipe G to the oil spraying members H and J, and through the pipe G to the reservoir G so that oil is fed, intermittently and in timed relation with the ram, to one end of each oil spraying member and air is simultaneously fed to the opposite end of each oil spraying member to effect atomisation of the oil as hereinafter described.

The oil spraying members'are illustrated on an enlarged scale in Figures 2 and 3 from which it will be seen that each of the air pipes H and J 1 communicates with the open end of two longitudinal bores L formed in the oil spraying member, whilst each of the oil pipes H and J communicates with the open end of a longitudinal bore L Each oil spraying member is provided with two atomising nozzles each of which is constituted by a radial oil conduit M leading from the bore L to a recess M and two air conduits N leading from the bores L to the said recess M The recesses M in each oil spraying member lie opposite to an opening N in an outer sleeve portion N of the spraying member, the openings N lying respectively above and below the work K, which passes between guide rollers O on its way to the anvil D.

When the press is in operation the cam E intermittently opens the valve E and thus causes oil to be supplied from the reservoir G through the pipes H and J to thebores L air under pressure being simultaneously suppliedthrough the pipes H and J to the bores L. The oil flowing from the outer ends of the conduits M is thus atomised or sprayed, by the air flowing from the conduits N, through the openings N on to the two opposite faces of the work K upon which the press operates.

The two cooperating oil spraying members are mounted to rotate about the axes of the pipes H H and J J and interengaging quadrants P are provided on the spraying devices so that by operation of a lever P secured to one quadrant both oil spraying members are rotated. The distance between the anvil D and the part of the work K on to which the oil is sprayed can thus be adjusted to suit requirements.

In the modified arrangement shown in Figure 4 the air supplied under pressure flows from the valve E through a single pipe G to the pipes H and J and to the reservoir G.

It will be understood that the construction above described is given. by way of example only and that details may be modified. For example, a single preferably rotatable oil spraying member, which sprays oil on to only one face of the work, may be provided.

What I claim is:

1. In a lubricating system for a punch press, comprising a frame including a stationary member, a reciprocating member for intermittently cooperating with said stationary member, a work guiding means for directing to said members the material upon which an operation is to be performed, a spray assembly mounted for movement with respect to the material and for directing a spray of lubricant ontopsaid material prior to its entry between said members, and an actuating means connected to said spray assembly for moving the same to vary the direction. of said spray along said material.

2. In a lubricating system for a punch press, comprising with a frame including a stationary member, a reciprocating member for intermittently cooperating with said stationary member, a work guiding means associated with said press and for guiding toward said members in a predetermined direction the material upon which an operation is to be performed, a spray device mounted for rotation with respect to said material about an axis perpendicular to the direction of movement thereof and including a plurality of spray openings spaced axially of said device for directing sprays of lubricant onto said material prior to its entry between said members, and a means connected to said spray device for rotating the same.

3. In a lubricating system for a punch press, comprising a frame including a stationary member, a reciprocating member for intermittently cooperating with said stationary member, a work guiding means for directing to said members the material upon which an operation is to be performed, a. pair of spray devices movably mounted, respectively, on opposite sides of said material and for directing a spray of lubricant onto the material prior to entry thereof between said members, and a motion transmitting means interconnected between said spray devices: for compelling simultaneous movement thereof with respect to said material to direct the respective sprays in the same direction along said material.

4. In a lubricating system for a punch press, comprising a frame including a stationary member, a reciprocating member for intermittently cooperating with said stationary member, a work guiding means for directing to said members the material upon which an operation is to be performed, a pair of spray devices rotatably mounted, respectively, on opposite sides of said material and for directing a spray of lubricant onto the material prior to the entry thereof between said members, a pair of gear segments connected respectively to each spray device and intermeshing beyond one edge of said material, and an actuating means connected to one of said gear segments and for rotating both gear segments and attached spray devices to direct the respective sprays in the same direction along said material.

5. In a lubricating system for a punch press, the combination with a frame including a stationary member, a reciprocating member for intermittently cooperating with said stationary member, and a work guiding means for directing to said members the material upon which an op eration is to be performed, of a spray assembly including a body member having two ends, provided with a lateral spray opening and also provided with at least two internal passages extending respectively and independently from said ends of the body member to said spray opening, a lubricant supply conduit connected to one end of said body member, and an air supply conduit connected to the other end of said body member.

6. In a lubricating system for a punch press, comprising a frame including a stationary member, a reciprocating member for intermittently cooperating with said stationary member, a work guiding means for directing to said members the material upon which an operation is to be performed, a spray assembly including a body member having two ends, provided with a lateral spray opening and also provided with at least two internal passages extending respectively and independently from said ends of the body member to said spray opening, a lubricant supply conduit attached to said frame and rotatably connected to one end of said body member, and an air supply conduit also attached to said frame and rotatably connected to the other end of said body member whereby said spray assembly is rotatably supported adjacent said work by said lubricant and air supply conduits.

7. In a lubricating system for a punch press, comprising a frame including a stationary member, a reciprocating member for intermittently cooperating with said stationary member, a work guiding means for directing to said members the material upon which an operation is to be performed, a pair of spray devices each including a body member having two ends, each provided with a lateral spray opening and also provided with at least two internal passages extending respectively from said ends of the body member to said spray opening, a lubricant supply conduit attached to said frame and including a pair 01' pipes respectively located above and below said material and each rotatably connected to one end of each body member, an air supply conduit also attached to said frame and including a pair of branches respectively located above and below said material and each rotatably connected to the other end of each body member, and interengaging means connected to both of said body members for compelling their simultaneous rotation to direct the respective spray openings in the same direction along said material.

8. A spray device adapted to be mounted for rotation about an axis, comprising a body member having axially opposed ends, provided with a laterally located spray recess, provided with an internal passage including a portion extending to one end only of said body member and including a radial portion extending into said spray recess, and provided with a second internal passage including a portion extending to the other end only of said body member and including a radial portion extending also into said spray recess and inclined radially toward the radial portion of the first mentioned internal passage.

9. A spray device adapted to be mounted for rotation about an axis, comprising a body member having axially opposed ends, provided with a laterally located spray recess, provided with an internal passage including a portion extending to one end only of said body member and including a radial portion which is perpendicular to said axis and which extends into the center of said spray recess, said body member also being provided with a second internal passage including a portion extending to the other end only of said body member and including a radial portion which extends into one side of said spray recess and which is inclined toward the radial portion of the first mentioned internal passage.

10. A spray device adapted to be mounted for rotation about an axis, comprising a body member having axially opposed ends, provided with a laterally located spray recess, provided with an internal oil passage including an axial portion extending to one end only of said body member and including a radial portion which is perpendicular to said axis and which extends into the center of said spray recess to form an oil outlet, said body member also being provided with an internal air passage including an axial portion extending to the other end only of said body member and including a pair of radial portions which are both inclined toward the radial portion of said oil passage and both of which extend into said spray recess on opposite sides of said oil outlet.

WILHELM WALTER. 

